The fundamental difference lies in programmability and versatility. A calculator is designed for performing arithmetic operations, following a predefined set of functions. A computer, conversely, executes a sequence of instructions contained within a program. This program, modifiable and expandable, enables computers to perform a wide variety of tasks, extending far beyond numerical calculations. For example, a calculator can add numbers; a computer can manage finances, create documents, design buildings, or simulate complex systems.
This capability has driven transformative progress across numerous fields. Early calculators, limited by their hardware, addressed specific mathematical needs. The evolution of computers allowed for automated calculations, data processing, and complex simulations, leading to breakthroughs in science, engineering, and business. The impact of this increased adaptability is evident in the pervasive integration of computers in nearly every aspect of modern life, offering efficiency and capabilities unimaginable with earlier, simpler calculating devices.